Machine for bending pipes



Oct. 16 1923.

B. J. LINDGREN MACHINE FOR BENDING PIPES Filed March i7. 1922 '7Sheets-Shes?l 1 Oct. 16 1923. 1,471,176

s. J. LINDGREN MACHINE FOR BENDING PIPES Filed March 17. 1922 '7sheets-Sheet 2 Oct. 16 1923.

B. J. LINDGREN MACHINE FOR BENDING PIPEs Filed-March 17 1922 '7Sheets-Sheet 3 i", gif;

Mv- J? 717-0 r11 Pgs Oct. 16 1923. 1,471,176

E. J. LINDGREN MACHINE FOR BENDING PIPES Filed March 17. 1922 '7Sheets-Sheet 4 Oct. 16 1923.

B. J. LNDGREN MACHINE FOR BENDING PIPEs Filed March 17 1922 7Sheets-Sheet 5 u w.. 7%? e.:

B. J; LINDGREN MACHINE FOR BENDING PIPES Oct. 16 1923. 1,471,176

Fied March 17. 1922 '7 Sheets-Sheet 6 oct. 1e. 1923. 1,471,176

E. J. LINDGREN MACHINE FOR BENDING PIPES Filed Marcin 17. 1922 '1sheets-sheet v i A f/ l" 4 x W1 36 i 4Z m l /Izven0r Paienied oci. 16,1923.

@Miren STATES 1,471,176 PATENT oFF-ice.

EROE J. LINDGREN., F BUFFALO, NEW YORK, SSNOR TOl IGAR MACHIEE '6a TOOLWORKS, 0E BUFFALO; NEW YORK, A CORPORATION OF NEW YORK.

MACHINE Fon .surname yruins.

IToe-'ll whom if, may concern:

Be it known t" at il?, Bion J; LINDG'REN, a

vcitizen of the nited States, residenti of Buffalo, in the county of'Erie end State of .5 'New York, have invented new e'ndus'efulimprovements in 'Machines for' Bending Pipes, of which ther follovcfing4s a. speoicetion,

1o bendingr info' elle-ow form' pipes which have 'been reieesly formed''ef sheet metal' so 'tiret t e central plrt' oftlfispipe slpro'vded withcircumferential corrugetions; While the opposite ends ofthe sein-e areof cylindrical 1s er uneerrnget-ed fermsueh elbe'svs being commonly usedfor' conducting the smoke Airemstoves' 1e Ichimneys einer for smlerVmrleos'es. M i

Itis the object of tlisinventon 'to pro- 120 @luce a mclrne whereby suchpreviously corrugzitedapipes may be bent `into elbow "formexpedtiousljeasily and economically 'and with certainty, seth-at there'will be no imperfect goods which must be 'discarded as 'wstenl "l j AIn the' accompnyinj'drawings: Figure lis a front elevation' e 1 je pipe.bending maehire ef'nbedying myiiwentiee, showing the positionof `theparte which they assume pre- 'I'l'fl prrreitoryto' Bending tlie seme,from :i sti-aight' intoun elbow form,A YFlglllg 2' is` a sil-deel'evtion oftliesane.' Figuifej is a top planriew' of thesame, partlysection. Figure 4 is fragmentary vertcltransferse section, teren on unee 4,1i1g; 3 and show; ingtlie position ofthe ipaqrt'sf prepaiatory tomounting i straight er unbent 'pipe upon the cllclfrs; of theli'naclrine Figure 5 is: e View similar to Fig. 4, but showingtljiepai'ts in the'fnositon which' they occupy after'- the bendinef' ofthe pipe from its straight into elbow' grm'hsfbeen' completed. Figure 6is f1 Similar /vie'w .Showing thel manner Ain whiclione ofltheA ehucsisdisenge' ed from the pipe atertlieismiehes been 'ent intoe'lboiV-S'heped'ffrn prepratory to rriioing the elborkroni `-thevmachine; Figure 7 is e fragmentary 'fepplenivew ef the machine, 'purelyin' section. snowing the movable cheek in its retracted postenVpreparatory to'engeging a pipe inetV position Ysi'inleito 'thetshowninFigi 4QA Figurev 8 is asimilar new showing the leekiii mechanism for Ylioldiif the movable '.,ciiu'c in its operative metier. is e verticaltransverse therefrom.

rvegisesection of the machine taken on line t Y Y A ll-lL'Fi'g. 3.Figure 12 is a. perspective Thieilnvemien relates te e machine ,fer

vsection,italien on line A9-,9, Fig. 3 und showing one of the chuckscleszed uponfone end of the pipe wlnichvisy to Abe bent into elbowv4form. Figure 10 is a similar view but showing' the chuck opened andthe pipe removed Figure 11 is a Vertical trans- Vviewrofl a'`iiiziislfied elbow which has been produced ,on thefinachineembodyingniy invention'. Figure 13 is :s fragmentary top plan Viewshowingmeens for` adjusting the throw'of the chuckarms to permit of makingpipe elbows ofdiferent singularity. Figure 14 is et cross section oftlie sametaken on line 121-14, Fig. I3.

Similar characters of reference refer to like parts throughouttlieseveral views.

The straight or cylindrical pipe Vblank which is to be operated uponr bythis machine has its central part provided with a plurality ofcircumferential corrugations 2O which have been previously compressed toa. suitable extent and two-.plein or uncorrugated cylindrical parts 21arra .ed at oppo- Vsite `ends of this ipe, as shown y full lines i'nFigs. l, 3 anc a 4- iind by dotted lines in ling. 12. Thenoperation ofthe macliine forming the subject` of this invention results in bendingthis straight pipe blnk into elbow form so that lthe cylindrical orunc'orrugatecl ends 21 thereof, aienrranged at right angles to eachotliefi` andthelcorruga- 'tions on the .central part thereof aresqueezed incre closely togefher,`while those parts of ehucl'rs, 4,forinstaneeythe chuck 24 on tlie .telt 'hund side of tliemjacliine.. is, somounted thnttlie same is cpeljle only of e. .vertically Swinging motion,while the otlieichuck 25 on' 'the yright hand side of the machine iscapable notonly offafvertically swinging friction vreliti'vely to theother chuck, but also iepeble gf grieving lengthwise of its axis,

relatively thereto for the purpose of permitting theV two chucks to beenvgedwith the pipeblank previous to' bending the latter and thereafterdisengaging the pipe blank from-the chucks preparatory to bendinganother.-` y i 1 Y Although these chucks may be variously constructed,each of the same,"fsshown in the drawings, preferably comprises a suporting head, a core niountedon t e head and adapted to engage with theunderside of one of the 'uncoriugatedends of the pipev blank and a clampadapted to engage the periphery of' the corresponding uncorrugate'd endVof this blank. Each ofthe supporting heads preferably comprises avertical transverse Vbase, plate 26 and a bracket 27 projectingforwardly from this basev plate., L'The core is,

provided with an inner cylirfidlical end: 28 and hasA its outer enddetachably connected with the 4inner side of the bracket 27 byy means ofa bolt 29 and the same is also held against turning about its axis onthis bracket by one or more keys 30, eachof which engages withcorresponding grooves or recesses 31, 32, formed in the opposing facesof the bracket 27 and the respective core 28, as shown in Figs. 1, 3andV 7. I

Each of the clamps, as shown fpr instance, in Figs. 1, 3, 4, 7, 9 and10, comprises two curved jaws 33, 34, which practically form twosections of a diametrically split ring and are movable towardfand fromtheupper and lower sides of thel periphery of one of the uncorrugatedends of thepipe blank. The clamping jaws are `pivotally` connected attheir corresponding 4rear'eriids with the base of the chuck, so as to`becapable of swinging vertically toward and from each other, this beingpreferablyaccomplished by means of a pivot pin 35v`passing throughcorresponding perforated lugs 36V and 37 formed respectively onjtherear* ends ofthe clamping jaws 33and the adjacent artof the base plate36. Attheir front en s these clamping jaws are provided lwith meanswhereby the jaws are openedy and `closed which means in theirpreferr'edform con sists ofthe verticallyswingin lever 38 which ispreferably of-bifurcatel form and pivoted to the front end .of the upperjaw V33 and a link 39 pivotally connected at its upper end with thelever 38 and also lpivotally connected at 'its lower end with the frontend fof thelower jaw, this last-mentioned pivotal connection preferablyconsisting of a pivot-block "40 pivoted by means of horizontal 41to ears42` on the lower clamping jaw and provided with an opening whichreceives the lower end of the link 39 and screw nuts 43, 44 arranged onthe link 39 and engaging rwith opposite ends of the pivot head 40, asshown in Figs. 1, 7, 9and 10. Upon swinging the lever 38 downwardly theclam ing jaws 33 will Vspread apart, as shown 1n Fig. 10 and therebypermit one end of the pipe to 'be inserted between these jaws and therespective core, aswell as removed therefrom, while upon "swin in thislever u wal-dl as shown in g g P Y operation ofv bending ythe same froma straight into an elbow shaped form. y The pivotal connections betweenthe lever 38 f and the upper jaw-33V and between this linkV39fand-thelever and the lower .jaw are such that when the lever isturned upwardly and rearwardly,'the pivotal connection between thelinkand this lever `will be slightly bel"jfonld'theV pivotal connectionbetween thele- 'veri and the upper jawVv and thus operate toautomatically retain, these parts in their flocked position@ adjustingthe screw /nuts 43, 44 in the link 39 the clamping jaws may be adjustedrelative to the core for producing the desired gripping effect upon apipe. The lower jaw 34.- is preferably provided on its rear part with astop 45 which is adapted to engage with a part projecting forwardly fromthe base plate, of the chuck, as shown in Fig.V 10,. and thus `causeboth jaws to recede yfrom the, periphery of thel core pon, moving] thegripping levery 38 downwardlr A verit"cally swinging" movement isvilmparted to these chucks .,SQ that they stand with rtheir Taxesho'riznilly'in line transversely of -the'lmachine ypreviousto and whilein engagement with the unbent pipe blank then V,these two chucksareswung down- "wardly into-a position in which they stand latsubstantiallyright angles to each other "for the purpose of bending the pipe from astraightinto elbow form. For this. purpose two7 vertically swingingchuck arms 46, 47"are provided which lhave their opposing inner endspivotally connected with the upper'part of an uprightframe or standardor pedestal 48 whileu the outer ends of these chuclnarms carry thechucks which grip opposite endsof the pipe blank. Although the pivotalvconnection between the inner ends of these chuck arms may be varied,this is preferablyaccomplishedI by providing the inner end A'oi:l each`chuck Aarm with a air of pivotflliigsS, 5D, each of which recelves aliorizfontaldongitudinal ,pivot pin 51, each of'r'which'isvsecured atits opposite ends to upwardly projecting lugs 52, 53 on the standard. Onthe outerY arts of the chuck arms, the sainel are provifiiad withforward extensions 54, 575 upon which theV two chucks are mounted sothatthelatter are arranged in` front of the upper part of the pedestalor Stamilarc1.` Instead Of. mounting the heads -lll of the chuckdirectly on the extensions of the chuck arms these heads are mountedindirectly on these arms for convenience in machining and fitting theparts to each other, while manufacturing and assembling the same.

For this purpose supporting plates 56, 5T are employed which are mountedrespectively on the front ends of the lett and right hand extensions5lund 55 of the chuck arms and to the front sides ot these supportingplates are secured thc hase plates of the chuck heads. For the purposeot' accuratel)I alining the two chucks relativeltY to each other so thattheir axes are horizontally in line preparatory to mounting' the pipeblank thereon` which is to be bent into a'n elbow, each ol these chucksis provided with means wherein7 the same may be adjusted vertically onits supporting plate while the chuck is in a horizontal position. Asshown in the drawings this vertical adjustment is ohtained by means ofclamping bolts 58 pass,- ina through upright slots 59 in the base plateof each chuck and engaging; their ends with the respective supportingplate While their heads bear against the front, side of the respectivebase plates. as shown for instance in Figs. l. /1-7 and 9 and l0.

ln order to permit such 'vertical adjustment of the chucks relative tothe supportin;f plates and to guide the saine during such adjustment aswell as to firmly interlock each chuck head and supporti ne plate so asto relieve the clamping; bolts 58 from undue strain. the co-operatingrsurfaces of each chuck head and its companion supporting plate areprovided with cooperating vertical guiding surfaces which areconstructed to interlock in a horizontal direction this beingaccomplished in the preferred construction shown in Figs. l and 4 7, bymeans ot vertical ribs 6ft arranged on the rear side ot the hase plateot each chuck head and engaging with corresponding grooves 6l on theiront side ol' the companion support-ingr plate. The supporting plate 56which carries the left hand chuck is pret'- eebly secured permanently tothe forward extension 57 ot the lett hand chuck arm by means of bolts62. as shown. or by anv other suitable means, but the supporting' plate57 which carries the right hand chuck is movable lengthwise or parallelwith :i radial line ol' the richt hand chuck erin for the purpose otmoving the respective chuck away from the left hand chuck and thusprovide the necessaryY clearance between these chucksrto permit ofplacingf a blank on the chucks preparatorfv7 to bending the same into anelbow also enabling this pipe to be removed trom the chucks after thesame has beenV bent into an elbow form.

The means for guiding the lright hand supporting plateA lor this purposeconsists in providing the forward extension of the right hand chuck armwith a guide rail 63 which has its upper and lower edges beveled. sothat it is ofdove-tail form in cross section and providingr the upperand lower parts of the right hand supporting plate 5T with upper andlower gibs 64, 65 Which engage With the upper and lower edges of theguide rail 63 and thereby permit of sliding the right hand sup-portingplate 5T inwardly and outwardly for the purpose ot moving the right handchuck toward and from the left hand chuck. The lower gib 65 ispreterabtt1 secured in a definite position to the plate 57 by means ot'bolts 66 but the upper Acrib 64 is adjustahl),T mounted on the plate 57so as to permit ot a tight tit ot' the plate 57 on the guide rail 63 andalso enables Wear to he taken up. For this purpose horizontal clampingbolts 67 are pro'- vided which pass through vertical slots 68 in theupper gib 64 and engage their threaded front ends with the plate 57while their heads bear against the rear side of the upper gibr Gek asbest shown in Figs. l() and 11. The upper gib 6l is pressed toward theguide rail 63 so that the co-operatinpr K`duiding snrtaces ot the latterand the lcribs 6st. 65 and supporting` plate 5T tit each other snugly,this being preferably accomplished bv means et tivo tightening screws 69working in brackets 70 on the real` side ot the plate 5T and engagingwith the upper edge of the ,cih 64. as shown in Figs. 2. 3. T, S). 10and ll. The movement of the right hand supporting' plate 57 and thecorresponding* chuck mounted thereon toward und from the left handsupportingr head of the chuck is eli'ected preferably by means of a handoperated lever Tl which is piv-oted at its rear end to the right handchuck arm b v means of a; pin 72 and provided at its 'front end With ahandle 73 which projects upwardly therefrom, while its inner end isconnected by means ot' a link 74 with the outer end ot the sup-porting'head 57. ihile the right hand chuck is moved imvardlj.7 into itsoperative position in which it supports the right, hand end ot the pipeblank. as .shown in Figs. l and 3. means are provided for locking theparts in this position so that the chucks will not become separa tedduring;r the operation ot bending: the straight pipe blank into elbowshape.

The preferred locking device tor this purpose comprises aV catch 75arranged with` in a recess 76 in the righthand chuck arm and pivoted atits inner end thereto by means ot a pin 77 while its outer end isprovided with a hook 78 which is adapted to engage with a. shoulder 79on the hand operated lever T1. The hook ot this catch is provided with abeveled surface 80 und the same is ,vieldingly held in its forwardposition by means of a spring 8l arranged in the reress TG and hearingat its opposite ends against the catch and the adjacent part of thesupporting arm 47 so that upon swininr the hond lever 7l inwardlyY thehooi; To will engage automatically with the shoulder T9 and thereby holdthe longitudinally moviihle ehueli in its operative position. This eatrhis released from the hand lever Tl preparatory to swinging the latteroutwardly tor moving the right, hand .-liueli array trom the lett handchuck, this lining aefmmplished hy means ot a trigger lever protefl onthe hand lever 71 having its li-.nt'ilt arranged adjacentto theoperating handle Til while its lower arm is connected with the shittingrod which extentieV lengthwise ot the operatingn lever il and sided in nlug 84 on the onder eide the? of find is adapted to hear with its rearent ai nnst the free end of the eateh trom the shoulder T9` as shown inFig'. 3. in thi` met, therefore. ot' 'raspinp` the handle Til thetrigger S2 le also operated and therefore automatically releases thePatch T5 to permit the hand lever '7l to he swung' outwardly h v the useot one hand and praetieallv one operation.

The downward and upward swinging motion in the preferred construction ofEllis niarhine is imparted to the ehuek supporting nrms b v ineens of a(frank shaft- 85 whioh is liournaled horizontallyY and length-- wise insuitable hearings in the lower port ot the standard or main frame andprovided on its Central part with a mank 8G which latter is connected hvmeans ot' right and lett hand connecting rods 8S with the right and lefthand Chuck arms between their inner pivoted ends and Chucks on the outeredge ol' the saine. The elevated position ot' the shock arms in whirhthe axes of the two chucks :1re raised horizontally line. the crank 8Got the crank shaft is in its highesty position. as shown in Figs. l. 2and ll. Upon turning!r the Crank shaft :i halt' turn so that its crankis in its lowerxnost. position the two chuck supporting :irins will hehoth turned downwardly so that the)v stand substantially atI rightangles to eaeh other. as shown in Fig. 5. 'lhereatter another half turnof the crank shnlt will tiring its era nl( again to its uppermostposition-.1nd restore the chucks to their horizontal alined position.This rotaiav movement is imparted to the Crank shaft hv means .vhiehromprise a horizontal driving shaft 89 which is journaled lengthwise insuitable hearings on the main trame and provided with t(rear pinion 90which meshes with u gear wheel 91 having twice the diameter ot the gearpinion and secured to lhe. rear enti of the crank shaft, as shown h vfull lines in Fig. 2 and by dotted lines in Fig. l. The driving shaft isoperated by T5 For :lisengaeing ihe hook of the catch Ineens ot a beltpassingl around a pulley 92 `whieh is arranged on the rear end of thedriving shaft and adapted to he connected with and disconnected from thedriving shaft, hy means ot a elnteh 93 which latter is preterolil).Tcoupled upon operating a treadle 94 which is operatively eonnerted withthis clutch which at the end of each rotation of the pulley 92 the sameis automatieallyT uncoupled from this driving shaft. lt Jfollows fromthis that for earh depression of the treadle 94 the crank shaft willmake a half rotation so that h v depressing this treadle once the chucks'will he swungr from their upper horizontal position to their lowerangular position relatively to each other.` and upon 'another depressionof this treadle these chucks will he again raised from their lowerangular position to their elevated position in whieh the)Y are.horizontalllvT in line.

As shown in Fig. lf).y the stop 45 of the lower jaw of one of the vhueksengages with the adjacent clamping holtl 1S 'for limiting the descentot' this jaw ot the opening movement of the seme and its companion upper33, but ohviousl;` this opening movement of' the jaws may he limited hyengagement of the stop 45 with anv other suitable abutment on therespective ehneli.

ln the operation ot' this machine. one end ot a straight pipe blank isfirst. slipped over the eore of the lett hand ehuelr while the righthand ehuolt moved lengthwise away from the left hand chuck to providethe necessary.v clearance for this purpose. as shown in Fig. 4. The handlever 7l is then swung inwardljr so as to engage the Pore ot the righthand ohuek with the correspondiner end ot the pipe blank. as shown inFigs. 1 and 3. The elanniing jaws and 34 may he Closed upon the letthand end ot the pipe blank either before or after the left hand coreinserted into the correspondingr end of the pipe lil-ank and otter theleft hand wore has heen inserted in the pipe blank the clamping jaws 33.34 ol the right hand ehurlt are also closed upon the exterior of thepipe blank. The troadle 94 isnow depressed so that the crank 86 nievesfrom its uppermost to its lowerinost posi.- tion and then eoxnes to restby reason of. the automatic operation of the elnteh 93 whereby thechuelrs are moved Vtroni the upper horizontallyY alined position shownin Fig. l to their lower position in which they are arranged at an anglerelativelyv to eaol other, as shown in Fig. 5.

Thereafter the clamping jaws 33, 34 of the right hand chuck nre releasedfrom the elbow shaped pipe :1nd the hand lever 7l is unlocked and swungoutwardly whereby this ehuelt is disengaged from the corresponding endot the elbow-shaped pipe as shown in Fig. G. Upon now disengaging theclamp- Cla extension ot' the other erin in a direction parallel wi h eredini line thereof7 and ineens for moving said last-mentioned chuckradiaily on its erin extension.

l. in u machine ot' the character described` e standard. two chuck armshaving their inner ends pirotelly connected with opposite sides ot thestandard by horizontal longitudinal pivots sud provided on their outerends with 'forward extensions, s chuck nor- :nelly innnovelile on theextension of one ot said urine und adapted to engage one end of pipe.chuck adapted to engage the other end of seid pipe and movable on theextension ot the other erin in n direction perulei with n rndizil linethereof, ineens tor moving seid lest mentioned chuck rnd'r all)Y on its:irni extension comprising a lever pivoted on the respective erin and ulink connecting seid lever with the respective chuck.. und :i catchmounted on seid lustnientioned erin and adapted to engage with seidlever tor holding. the respective chuck in its operative position.

i. ln machine ot the character described. is standard. two chuck :irnishiivingl their inner` ends pirotiilliv connected With oppo site sides otthe standard bj( horizontal lon eitudinnl pivots und provided on theirouter ends with forward extensions, a chuck norniellj; immovable on theextension of one ot' seid iii-nis and adapted to engage one end of epipe, a chuc i adapted to engage the other end of seid pipe und movableon the eXtension of the other erin in a, direction parailel with eradial line thereof, ineens for ni ring seid lestiiientioned chuckradially on its arm extension comprising e lever pivoted on therespective arm and u link conneming seid lever with the respectivechuck, :i catch mounted on seid last-mentioned erin :nid adapted toengage With said lever for holding the respective chuck in its opere`tive position. and means for disengeging seid catch roin said lever.

t. In :i innchine of the character described, a standar-d. two chucknrnis having their inner ends pirotellT connected with opposite sides ofthe standard by horizontal longitudinal pivots and provided on theirouter ends with forward extensions, a chuck normally immovable on theextension of one of said arms and adapted to engage one end of a pipe` achuck adopted to engage the other end ot' seid pipe and movable on theextension of the other erin in a direction parallel with radial linethereof. ineuns for niorngf said lustanentioned.chuck radially on its srIn extension comprising u lever pivoted on the respective erin and :ilink connecting' seid lever with the respective chuck, a catch mountedon seid last-mentioned erin enit adapted to engage with seid lever forhold-v ing' the respective che `l; in its operative position` findineens tor disengeging seid catch from seid lever comprising' a shit'ting: rod guided on the lever :ind adapted to engage one end with saidcatch and :i trigger erranged on the lever adjacent to the handlethereof und engaging with tfie opposite end ot seid shifting rod.

"1'. In a machine ot the character described, two chucks adapte-d toengage opposite ends of e pipe, carriers supporting said chucks :indhaving lined pivots about which they :tre movable into ditlerent angularpositions relntiveliT to euch other, and ineens for acljusting thestroke of seid carriers tor wirf# ingl the angle of the pipe endsreletirel)Y to euch other.

2-5. ln e machine of the character described. two chucks adapted toengage opposite ends ot :i pipe, carriers supporting; said chucks undpivoted nt fixed points so :is to be cepeble oi moving the chucks intoditerent angw lar positions reletivelli,T to each other.` e crank shafthaving a crank, connecting' rods connected at one end With seid crank,and

Ineens connecting the opposite ends ot' said rods with said carrier andpermitting ot shifting the connection between each rod and carriertoward and from the exis of the latter for varying the angle of the pipeends relatively to each other.

9. A machine of the character described. comprising e freine, two chuckarms pivoted et fixed points on seid traine and each provided Withslots, chucks mounted on said chuck arms and adapted to support oppositeends of :i pipe, a rotary crenk.y connecting rods pivotally connected atone end with said crank, and bolts adjustable in said slots .findconnecting seid rods with said chuck arms tor varying the angle of thepipe ends relatively to each other.

BROR J. LINDGHEN.

